BL8095
24V/1.2A Asynchronous Buck Converter in SOT23-6
DESCRIPTION
The BL8095 is a high efficiency current-mode
asynchronous, 24V/1.2A buck converter. Its input
voltage ranges from 4V to 24V and it provides an
adjustable regulated output voltage from 0.810V
to 5.5V while delivering up to 1.2A of output
current.
The switching frequency is set to 1.4MHz, which
works with a inductor as small as 4.7uH. And the
BL8095 will automatically switch between PFM
and PWM mode based on the load current, thus
to enhance the converter efficiency at light load.
BL8095 consists of many protection blocks such
as UVLO, input voltage over voltage protection to
stand much higher input voltage spike, thermal
protection and output short circuit protection.
The BL8095 is available in the tiny SOT23-6
package.
FEATURES
Adjustable Output Voltage, Vfb=0.810V
Output current is up to 1.2A
Range of operation input voltage: 4-24V
Input voltage UVLO: 3.7V (voltage decreasing)
Input Overvoltage Protection @26V
Withstand input voltage spike >30V
Operating current at zero load: 0.8mA (typ.)
Line regulation: 0.1%/V (typ.)
Load regulation: 10mV (typ.)
High efficiency, up to 90%
Environment Temperature: -20C~85C
APPLICATIONS
Security Camera
Consumer Electronic Device for automobile
Portable DVD
ADSL Modem, WLAN router
Other 12V or double cell Li-ion battery
powered device
TYPICAL APPLICATION and PIN OUT
V
IN
12V
5
LOW CURRENT CONSUMPTION
BST
1
VIN
10nF
4.7μH
LC2325
BL8095
25V
10μF
4
SW
6
82K
V
OUT
5V/1.2A
EN
FB
GND
2
3
6.3V
22μF
16K
SW
6
VIN
5
EN
4
HBYW
1
2
3
YW:
Date code,
Year and Week
being assembled
BST
GND
SOT23-6
FB
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BL8095
MARK and ORDERING INFORMATION
Mark Explanation
HB: Product Code
YW: Date code
SW
6
VIN
5
EN
4
Ordering Information
Product ID
Devices per reel
BL8095CB6TR
3000
HBYW
1
2
3
BST
GND
SOT23-6
FB
PINOUT DESCRIPTION
PIN #
1
2
3
4
5
6
NAME
BST
GND
FB
EN
VIN
SW
DESCRIPTION
High side power transistor gate drive boost input
Ground.
Feedback input with reference voltage set to 0.810V
Enable input. Setting it to high level or connecting to Vin via a resistor may turn on the chip,
while setting it to ground level will turn off the chip.
Power input, the input capacitor should be placed as close to VIN and GND pin as possible
Power switching node to connect inductor
BLOCK DIAGRAM
EN
VIN
BST
REG
&REF
+
UVLO &
Thermal
shutdown
Current
Sense
-
+
FB
-
COMP
network
OSC
Σ
Slope Comp
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+
-
GND
PWM
Logic
DRIVER
EA
SW
2
BL8095
ABSOLUTE MAXIMUM RATING
Parameter
Max Input Voltage
Max Operating Junction Temperature(Tj)
Ambient Temperature(Ta)
SOT23-6 (
JC
)
Package Thermal Resistance
SOT23-6 (
JA
)
Storage Temperature(Ts)
Lead Temperature & Time
ESD (HBM)
Value
30V
125C
-20C
–
85C
110C / W
220C / W
-40C - 150C
260C, 10S
>2000V
Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect
device reliability.
RECOMMENDED WORK CONDITIONS
Parameter
Input Voltage Range
Output Voltage Range
Operating Junction Temperature(Tj)
Value
4V - 24V
0.81
–
5.5V
-20C
–125C
ELECTRICAL CHARACTERISTICS
(VIN=12V, T
A
=25
C)
Symbol
VDD
VOUT
Vref
V
UVLO
Ifb
Iq
LnReg
LdReg
Fsoc
RdsonH
Ilimit
Venh
Venl
Vovp
TSD
Parameter
Input Voltage Range
Output Voltage Range
Feedback Voltage
UVLO Voltage
Feedback Leakage current
Quiescent Current
Line Regulation
Load Regulation
Switching Frequency
High side Switch Rdson
Peak Inductor Current Limit
EN High Threshold
EN Low Threshold
Input Over-Voltage Protection
Over Temperature Proection
Ven=3V
Conditions
Min
4
0.81
Typ
Max
24
5.5
Unit
V
V
V
V
uA
mA
uA
%/V
%/A
Vin=12V, Ven=5V
Vin H-->L, Iout=0.5A
Active, Vfb=1V, No Switching
Shutdown, Vin=8V
Vin=5V to 12V
Iout=0.1 to 1.2A
Ven=3V, Vin=12V
Isw=200mA
Vin=12V, Vout=5V
0.790
0.810
3.7
0.1
0.6
6
0.1
0.02
0.830
0.4
1.0
10
1.0
1.5
1
1.4
250
2
1.5
26
150
1.8
350
3
0.5
MHz
mohm
A
V
V
V
Hystersis=40
C
C
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BL8095
TYPICAL PERFORMANCE CHARACTERISTICS
(Vin=12V, Vout=5.0V, L=4.7uH, Cin=10uF, Cout=22uF,
T
A
=25
C,
unless otherwise stated)
Switching waveform Vin=12V, Iout=0.5A
(CH1=Vin, CH2=Vout, CH3=SW, CH4=Isw)
Switching waveform Vin=12V, Iout=1A
(CH1=Vin, CH2=Vout, CH3=SW, CH4=Isw)
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BL8095
Switching waveform Vin=24V, Iout=0.5A
(CH1=Vin, CH2=Vout, CH3=SW, CH4=Isw)
Switching waveform Vin=24V, Iout=1A
(CH1=Vin, CH2=Vout, CH3=SW, CH4=Isw)
Load Transient Response
Vin=12V, Iout=0.12 - 1A
(CH1=Vin, CH2=Vout, CH4=Isw)
Load Transient Response
Vin=24V, Iout=0.12 - 1A
(CH1=Vin, CH2=Vout, CH4=Isw)
FUNCTIONAL DECRIPTIONS
Loop Operation
The BL8095 is a wide input range, high-efficiency, DC-to-DC step-down switching regulator, capable of delivering up to
1.2A of output current, integrated with a 250m MOSFET, with external schottky diode. It uses a PWM current-mode
control scheme. An error amplifier integrates error between the FB signal and the internal reference voltage. The output
of the integrator is then compared to the sum of a current-sense signal and the slope compensation ramp. This
operation generates a PWM signal that modulates the duty cycle of the power MOSFETs to achieve regulation for output
voltage.
Current Limit
There is a cycle-by-cycle current limit on the high-side MOSFET of 1.5A(typ). When the current flowing out of SW
exceeds this limit, the high-side MOSFET turns off and the external schottky diode rectifier turns on. Unlike the
traditional method of current limiting by limiting the voltage at the internal compensation node, which usually has large
variation due to duty cycle variance, this type of peak current limiting scheme provides a relatively more accurate limit
for output current, thereby lowering the requirements for system design.
Light Load Operation
Traditionally, a fixed current mode constant frequency PWM DC-DC regulator always switches even when the output
load is small. When energy is shuffling back and forth through the power MOSFETs, power is lost due to the finite
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